Compression grease-cup



(No Model.)

'D. H. MOGARTY.

COMPRESSION GREASE CUP. No. 363,156 Patented May 17, 1887.

I!) Will JHHFMIIIIIMHEHHHMJ Iintrnn' STATES stem? DAVID I-I. MOOARTY, or sr. LOUIS, MISSOURI.

COMPRESSION GREASE-CU P.

SPECIFICATION forming part of Letters Patent No. 363,15 6, dated May 17, 18:87.

Application filed February 2, 1887.

To aZZ whom, it may concern.-

Be it known that 1, DAVID H. McCiinrY, of the cityof St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Compression Grease-cup, of which the following is a full, clear, and exact description, reference being had to the acc0m panying drawings, forming part of this specification, and in which-- Figure I is a side elevation of my improved lubricator. Fig. II is a vertical section of the lubricator with the feeder or piston in its upperposition. Fig. IIIisasimilar view \viththe piston or feeder nearly to its lower position. Fig. IVis aperspectiveview of the expansible ring. Fig. V is a detail perspective view of the ring, showing the splice or joint.

My invention rclates'to a lubricator in which a piston is used to feed the oil from the cup; and my invention consists in features of novelty, hereinafter fully described, and

pointed out in the claims.

Referring to the drawings, 1 represents the oil-cup, having a scrcw-neck, 2, as usual, by

- which it is attached to the object to be lubricated. The neck is made hollow to receive a plug, 3,with a vent, 4, through which the oil is fed.

5 represents a piston located within the cup, and which is provided with a stem, 6, that extends through the cap 7 of the cup.

8 represents a spring of any suitable form located between the upper face of the piston and the cap of the cup, the office of which is to force the piston down as the oil escapes, and thereby cause the feed of the oil.

In the parts I have thus far described I claim no invention, per 80.

The periphery of the piston is made flaring, as shown at 10, and on the outside of this fits an expansible ring, 11. The ring is split at 12, having ajoint, as shown inFigs. IVandV, formed by a tongue, 13, fitting in a rabbet,14. The inner face of the ring is made beveling or inclined, as shown at 15, Figs. IV and V, and this bevel fits against the bevel of the piston, as shown in Figs. III. The ring is held on the piston preferably by means ofa disk, 16, attached to the piston by a screw, 17.

The action of the piston on the ring (when it is in its upper position, as shown in Fig, II) is to force the latter out against the inner Serial No. 226,260. (No model.)

wall of the cup, and as the piston descends, the strength of the spring decreasing, the pressure of the piston against the ring is diminished, and consequently the latter is not pressed out with as much force against the wall of the cup. The result of this is that a uniform pressure of the piston upon the oil is had irrespective of the location of the piston in the cup, the friction of the ring against the side of the cup being greatest when the force of the spring is greatest-that is, when the piston is in its uppermost position-both gradually decreasing as the piston descends. Thus I obtain a uniform feed of the oil, obviating the difficulty heretofore experienced of the oil feeding fastest when the piston is in its uppermost position, when the spring, of course, exercises a greater pressure upon it, it being evident that by the above-described arrangement of piston and friction device the said friction device is forced in contact with the inner wall of the cup by and with a pressure proportionate to the pressure of the piston.

There should be a little play left between the piston and the head of the screw 17, so as to allow the disk to move with the ring with relation to the piston.

I do not claim, broadly, a lubricator having a piston provided with an open expansible ring, for this is not the equivalent of my selfadjusting packing-ring, so formed on its inner surface that engagement with the correspondinglyformed periphery of the piston will result in expansion (and consequently friction between the ring and side of the cup) when any abnormal pressure is applied to the disk, such as would result from the pressure by means of the spring of the piston down upon the oil, and by this means avoiding unnecessary pressure by checking the direct action of the spring, and thereby securing a constant and uniform pressure and feed of thelubricant.

I claim as my invention 1 1. In alubricator, the combination,with the cup, the piston, and means for forcing said piston against the oil for expelling it, of a friction device forced in contact with the inner wall of the cup by and with a pressure proportional to the pressure on the piston, substantially as and for the purpose set forth.

2. In a lnbricator, the combination of the cup, a piston located within the cup, means for forcing the piston downward, and an expansible ring surrounding the piston and expanded and forced in contact with the inner wall of the cup by and with a pressure proportional to the pressure of the piston, substantially as and for the purpose set forth.

3. In a lubricator, the combination of the cup, a piston located in the cup, means for forcing the'piston downward, and a split eX- pansible ring surrounding the piston, the piston and ring having inclined engaging surfaces, substantially as and for the purpose set orthv 4. In a lubrioator, the combination of the cup, piston having an inclined periphery and located within the cup, spring forcing thepiston downward, split ring surrounding thepiston and having a beveled or inclined bearing fitting against the piston, and disk for holding the ring on thepiston, substantially as and for the purpose set forth.

5. The combination, in alubricator, of the cup, the piston located within said cup, means for forcing the piston downward, and an open expansible ring surrounding the piston and having the rabbet14 in one end thereof, anda tongue, 13, on the other end for entering said rabloet, substantially as and for the purpose set forth.

6; In a lubricator, the combination, with cup 1, of a piston for forcing out the oil, and having friction-ring 11, disk 16, and adjustingscrew 17, for allowing a slight up-and-down movement of said disk and ring on the screw and piston, respectively, and the spring 8, placed between the cap and piston, substantially as and for the purpose set forth.

DAVID H. MOOARTY.

In presence of- GEO. H. KNIGHT, EDW. S. KNIGHT. 

